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 $A9/169:   RS232 Flag: Start Bit check/Tape temporary

Kernal-Reference:

 BIT $00A9   : <A HREF="ROMAC06.HTM">$AC0C</A> <A HREF="ROME165.HTM">$E167</A>
 DEC $A9     : <A HREF="ROMF92C.HTM">$F997</A>
 INC $A9     : <A HREF="ROMF92C.HTM">$F993</A> <A HREF="ROMFBCD.HTM">$FBEC</A>
 LDA $A9     : <A HREF="ROMF92C.HTM">$F9EB</A> <A HREF="ROMFBCD.HTM">$FBE3</A>
 LDX $A9     : <A HREF="ROMEF59.HTM">$EF59</A>
 ORA $A9     : <A HREF="ROMF92C.HTM">$FA59</A>
 STA $A9     : <A HREF="ROMEF7E.HTM">$EF89</A> <A HREF="ROMFB97.HTM">$FBA3</A>

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